A important source has informed Fightnews.com about the possibility that former WBC middleweight champion Julio Cesar Chavez Jr. could have ended his training relationship with Hall of Fame trainer Freddie Roach. According to the source, Chavez Jr has apparently been talking with another Hall of Famer Nacho Beristain as well as Robert Garcia. Chavez Jr has also been using Twitter to challenge current world champion Sergio ‘Maravilla’ Martinez to a rematch.